Solution : https://service.sap.com/sap/support/notes/1425646 (SAP Service marketplace login required)
Key words : 
runtime error message_type_x occurs, terms runtime error, error processing control, transaction va01/va02, maintain texts, billing document, manually delete, double-click, short dump, loleau02 reason
Related Notes : 
       
| 1273913 | Runtime error MESSAGE_TYPE_X with Unicode text maintenance | 
| 954372 | Short dump when navigating to text screen (troubleshooting) |